Firebolt grenades are a huge problem right now, for Guardians and Bungie alike it seems. So here's my simple suggestion to fix this issue without having to nerfing anything.
Create an armor perk, similar to Angel of Mercy, which reduces DoT damage a little and maybe reduces the number of ticks they deal out. Call it Antidote or Flame resistance or whatever, but give us the choice to spec our Guardians accordingly and you don't need to nerf anything.
Just my two cents and apologies if this has already been suggested, but I'm tired from hopeless LFG raids all day and honestly couldn't be bothered to search. As far as I can tell this way would have little to no effect on PvE either, no more than swords already do anyway. Thanks.
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Similar ideas have been floating around. It would be nice to have new perks that counter other strong perks, rather than just straight up nerfing what gives a class or weapon its niche (new thorn changes come to mind...).